355602421 has 6 divisors (see below), whose sum is σ = 357214722. Its totient is φ = 353997360.

The previous prime is 355602407. The next prime is 355602427. The reversal of 355602421 is 124206553.

It can be written as a sum of positive squares in 3 ways, for example, as 211266225 + 144336196 = 14535^2 + 12014^2 .

It is a de Polignac number, because none of the positive numbers 2^k-355602421 is a prime.

It is a super-2 number, since 2×355602421² = 252906163642122482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 355602421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355602427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49051 + ... + 55831.

It is an arithmetic number, because the mean of its divisors is an integer number (59535787).

Almost surely, 2^355602421 is an apocalyptic number.

It is an amenable number.

355602421 is a deficient number, since it is larger than the sum of its proper divisors (1612301).

355602421 is an frugal number, since it uses more digits than its factorization.

355602421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239 (or 7010 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 355602421 is about 18857.4234984528. The cubic root of 355602421 is about 708.4701709831.

Adding to 355602421 its reverse (124206553), we get a palindrome (479808974).

The spelling of 355602421 in words is "three hundred fifty-five million, six hundred two thousand, four hundred twenty-one".